Base
Lighthouse, Earth Orbit; Starlight Citadel, Otherworld; formerly Braddock Manor; Braddock Lighthouse, England; New York City (during exchange trip, specifically Peter Parkers Manhattan apartment); flat near Thames University, London
The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattans surface), X-Factor Is sentient starship